Its beautifully designed, has a really intuitive and well set out backend and also a choice of inbuilt looks/templates to tailor to suit your own site. The css is also well structured and very easy to adapt for a more personal look and feel.
I had a problem with installation due to a small bug with user avatars and Stackidea's got back to me in a few hours and had not only fixed the bug but updated the software for other users!
Brilliant software, great company excellent support, you MUST have it!! :)